import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;

public class Main {
  public static void main(String[] args) {
    try {
      String filepath = "D:\\Eclipse workspace\\Fraktale Java\\files\\rect_out";
      File fXmlFile = new File(filepath + ".xml");
      DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
      Document doc = dBuilder.parse(fXmlFile);
      doc.getDocumentElement().normalize();

      float oldSize   = 0.f;
      float newSize   = 0.f;
      float oldX    = 0.f;
      float oldY    = 0.f;

      Element root = doc.getDocumentElement();

      System.out.println("Root element :" + root.getNodeName());
      NodeList nList = doc.getChildNodes();
      System.out.println("-----------------------");
      System.out.println(nList.item(0).getChildNodes().getLength());
      //int rectCount = 0;

      for (int temp = 0; temp < nList.getLength(); temp++) {

        Node nNode = nList.item(temp);

        if (nNode.getNodeType() == Node.ELEMENT_NODE) {
          Element eElement = (Element) nNode;

          oldSize = Float.parseFloat(getAttributeValue("width", (Element) (getTag("rect", eElement))));
          newSize = oldSize/3;
          setAttributeValue("width", Float.toString(newSize), (Element) (getTag("rect", eElement)));
          setAttributeValue("height", Float.toString(newSize), (Element) (getTag("rect", eElement)));

          nNode.removeChild(getTag("rect", eElement));

          Element[] newRects = new Element[8];
          float x = 0;
          float y = 0;
          for(int i = 0; i < newRects.length; i++) {
            if((x == 1) && (y == 1))
              x++;

            newRects[i] = doc.createElement("rect");
            newRects[i].setAttribute("x", Float.toString(oldX+x*newSize));
            newRects[i].setAttribute("y", Float.toString(oldY+y*newSize));
            newRects[i].setAttribute("width", Float.toString(newSize));
            newRects[i].setAttribute("height", Float.toString(newSize));
            newRects[i].setAttribute("fill", "white");
            root.appendChild(newRects[i]);
            if(x == 2) {
              x = 0;
              y++;
            }
            else
              x++;
          }
        }
      }

      TransformerFactory transformerFactory = TransformerFactory.newInstance();
      Transformer transformer = transformerFactory.newTransformer();
      DOMSource source = new DOMSource(doc);
      StreamResult result = new StreamResult(new File(filepath + "_out.xml"));
      transformer.transform(source, result);

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private static String getTagValue(String sTag, Element eElement) {
    NodeList nlList = eElement.getElementsByTagName(sTag).item(0).getChildNodes();

    Node nValue = (Node) nlList.item(0);

    return nValue.getNodeValue();
  }

  private static Node getTag(String sTag, Element eElement) {
    Node nNode = eElement.getElementsByTagName(sTag).item(0);

    return nNode;
  }

  private static String getAttributeValue(String sAttribute, Element eElement) {
    return eElement.getAttribute(sAttribute);
  }

  private static void setAttributeValue(String sAttribute, String sValue, Element eElement) {
    eElement.setAttribute(sAttribute, sValue);
  }
}